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Electronic Doorbell Circuit

This simple and cost-effective ding dong electronic doorbell circuit is based on IC 8021-2. The IC has an in-built circuitry to produce ding dong sound each time its pin 3 is pulled low. The sound is stored in the IC as bits, as in a ROM. The sound output from the IC can’t however drive a speaker directly, as this puts strain on the device.

Therefore a complementary-pair, two-transistor amplifier is used to amplify the sound to a fair level of audiblity. You may either use a piezo tweeter or an 8-ohm, 500mW speaker at the output. This simple electronic doorbell has not been tested.

During the standby period, the IC consumes nominal current of a few microamperes only. Therefore switch S1 may be kept closed. Each time switch S2 is pressed, ding dong sound is produced twice. If you try to press switch S2 a second time when the first ding dong sound is still being produed, it has no effect whatever and the two ding-dong bell sounds will be invariably produced.

Fine. Good concept and interesting too. I think it is better to give some more detailed explanation about this circuit. I have another circuit for automatic door bell with object detection. If you are interested about that circuit diagram, then visit http://goo.gl/D26en

The heart of this ding dong bell project IC 8021-2 is not available in kolkata. P. Marian the author of this circuit, Sir can you tell me please where I can purchase this IC? Otherwide the circuit is nothing to do.